1. In a defective manner. Deficient numbers, those numbers the sum of whose aliquot parts is less than the numbers themselves.

Nuttall's Standard dictionary of the English language By Nuttall, P.Austin

• seficiently,
• xeficiently,
• ceficiently,
• reficiently,
• eeficiently,
• dwficiently,
• dsficiently,
• ddficiently,
• drficiently,
• d4ficiently,
• d3ficiently,
• dediciently,
• deciciently,
• deviciently,
• deficently,
• deficiantly,
• malficiently,
• eligiently,
• eficciently,
• eficicently

• defiantly,
• decently,
• efficiently,
• deficient.

The adjective form of the word "deficiently" is "deficient".

The plural form of the word "deficiently" is "deficientlies".

The singular form of the word "deficiently" is "deficiency"